Abstract
BackgroundGrain size is one of the key factors determining yield and quality in rice. A large number of genes are involved in the regulation of grain size parameters such as grain length and grain width. Different alleles of these genes have different impacts on the grain size traits under their control. However, the combined influence of multiple alleles of different genes on grain size remains to be investigated. Six key genes known to influence grain size were investigated in this study: GS3, GS5, GS6, GW2, qSW5/GW5, and GW8/OsSPL16. Allele and grain measurement data were used to develop a regression equation model that can be used for molecular breeding of rice with desired grain characteristics.ResultsA total of 215 diverse rice germplasms, which originated from or were developed in 28 rice-consuming countries, were used in this study. Genotyping analysis demonstrated that a relatively small number of allele combinations were preserved in the diverse population and that these allele combinations were significantly associated with differences in grain size. Furthermore, in several cases, variation at a single gene was sufficient to influence grain size, even when the alleles of other genes remained constant. The data were used to develop a regression equation model for prediction of rice grain size, and this was tested using data from a further 34 germplasms. The model was significantly correlated with three of the four grain size-related traits examined in this study.ConclusionRice grain size is strongly influenced by specific combinations of alleles from six different genes. A regression equation model developed from allele and grain measurement data can be used in rice breeding programs for the development of new rice varieties with desired grain size and shape.Electronic supplementary materialThe online version of this article (doi:10.1186/s12284-015-0066-1) contains supplementary material, which is available to authorized users.
Highlights
Grain size is one of the key factors determining yield and quality in rice
Despite the similar allele combination patterns in these groups, average grain length (GL) was significantly different only for group LA–LC (Additional file 4). These results indicate that allelic variation at GRAIN SIZE 3 (GS3) plays an important role in regulation of rice GL in the presence of a certain allele combination of four other genes (Zhonghua11-allele of GRAIN SIZE 5 (GS5), Nipponbare-type of qSW5/GW5, type I-allele of GRAIN SIZE 6 (GS6), and Basmati-allele of GW8/OsSPL16)
Our results showed that a relatively small number of allele combinations persisted in the diverse rice germplasm collection, and that these combinations were significantly associated with differences in grain size
Summary
Grain size is one of the key factors determining yield and quality in rice. A large number of genes are involved in the regulation of grain size parameters such as grain length and grain width. Different alleles of these genes have different impacts on the grain size traits under their control. The combined influence of multiple alleles of different genes on grain size remains to be investigated. A combination of different factors influence the grain size of rice. These include GL, GW, LWR, and grain thickness, all of which significantly correlate with grain weight (Tan et al 2000). Rice grain size and yield are closely related to one another and can be explained by a combination of grain size-related traits
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